8-Geologic Time - Geologic Time Chapter 8 Why do we care...

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Unformatted text preview: Geologic Time Chapter 8 Why do we care about time? Many important geologic problems can only be understood by studying the rate or frequency at which a process occurs.-How fast do mountains grow/erode?-How frequently do earthquakes strike or volcanoes erupt?-Relative timing of different events can also provide insight in to cause and effect. Relative vs. Absolute Age Relative Age : the occurrence of one event in relation to another Which came first? Absolute Age : the number of years that have passed from the event until now When did something happen? Put a number on it! How do we order events? se a set of geologic rules. inciple of Superposition This states that whe cks were deposited, newer ones were placed rmed on top of the older ones How do we order events? inciple of Original Horizontality sediments ar posited in nearly horizontal beds How do we order events? nciple of Cross-Cutting Relationships geologi tures that cut across rock must be younger th rock they cut through How do we order events? nciple of Inclusions objects enclosed in rock ust be older than the time of rock formation granite older sedimentary rock older How do we order events? inciple of Lateral Continuity layers are ntinuous until encountering an obstruction How do we order events? Principle of Faunal Sequence: yers of sedimentary rocks contain fossils in a definite sequence E This will be on your test!This will be on your test!...
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This note was uploaded on 03/01/2011 for the course GEO 302D taught by Professor Rowe during the Spring '07 term at University of Texas at Austin.

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8-Geologic Time - Geologic Time Chapter 8 Why do we care...

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